Light source 4 (e.g. halogen lamp, LED) illuminates a field of view of sensor 10 on surface 6 (e.g. road, track, runway). Optical engine 3 collimates light from the field of view onto the sensor. Sensor 10, comprising array of photodetectors 1 and spatial-variable filter 2 which limits the wavelength of light incident on each photodetector, measures the spectrum of incident light. The wavelength of light able to pass through filter 2 may vary linearly or discontinuously across the filter, and may be short-range (near) infra-red (900-1700 nm). The optical engine may comprise an aperture and/or focussing or collimating lenses. By analysing the sensor data, a controller may determine the presence of a contaminant or the surface condition, may identify the contaminant (e.g. water, snow, ice, de-icing salt, oil, leaves) or its thickness, may identify the chemical composition of the contaminant, and may estimate the tyre-to-surface friction coefficient.
Surface condition sensor
2021-04-07
Patent
Elektronische Ressource
Englisch
IPC: | G01N Untersuchen oder Analysieren von Stoffen durch Bestimmen ihrer chemischen oder physikalischen Eigenschaften , INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES / B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / G01J Messen der Intensität, der Geschwindigkeit, der spektralen Zusammensetzung, der Polarisation, der Phase oder der Pulscharakteristik von infrarotem, sichtbarem oder ultraviolettem Licht , MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT |
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